It never.
But it does look like some sort of store, and who says there can't be more than one store. There has never been just ONE store anyway.
WW:
Tom Nook, Crazy Redd sold furniture
Able Sisters sold Clothes
CF:
Gracie Grace, Tom Nook, Crazy Redd sold furniture
Able Sisters and Gracie Grae sold clothes.
AC3DS:
From what we know there's goin to be anothe Tom Nooks shop but you're served by either Timmy or Tommy. Gracie Grace will probably be back (not sure if it's confirmed or not) and possibly the Alpaca/Llama and Crazy Redd.
Able Sisters and Kicks?
and I heard somewhere a while ago (I'm not going around digging for sources, although it might of been mentioned on the round table discussion) that the city/mall is being expanded, so why not make more shops